AT89C51RC2-3CSCM(2003) 查看數據表（PDF） - Atmel Corporation

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AT89C51RC2-3CSCM
(Rev.:2003)

8-bit Microcontroller with 16K/32K Bytes Flash

Atmel Corporation 

4180B–8051–04/03

AT89C51RB2/RC2

Table 46. IPH0 Register

IPH0 - Interrupt Priority High Register (B7h)

7

6

5

4

-

PPCH

PT2H

PSH

3

PT1H

2

PX1H

1

PT0H

Bit

Number

7

Bit

Mnemonic Description

-

Reserved

The value read from this bit is indeterminate. Do not set this bit.

PCA Interrupt Priority High Bit

PPCH PPCL Priority Level

6

PPCH

0

0

0

Lowest

1

1

0

1

1

Highest

Timer 2 Overflow Interrupt Priority High Bit

PT2H PT2L Priority Level

5

PT2H

0

0

0

Lowest

1

1

0

1

1

Highest

Serial Port Priority High Bit

PSH PSL Priority Level

4

PSH

0

0

0

Lowest

1

1

0

1

1

Highest

Timer 1 Overflow Interrupt Priority High Bit

PT1H PT1L Priority Level

3

PT1H

0

0

0

Lowest

1

1

0

1

1

Highest

External Interrupt 1 Priority High Bit

PX1H PX1L Priority Level

2

PX1H

0

0

0

Lowest

1

1

0

1

1

Highest

Timer 0 Overflow Interrupt Priority High Bit

PT0H PT0L Priority Level

1

PT0H

0

0

0

Lowest

1

1

0

1

1

Highest

External Interrupt 0 Priority High Bit

PX0H PX0L Priority Level

0

PX0H

0

0

0

Lowest

1

1

0

1

1

Highest

Reset Value = X000 0000b

Not bit addressable

0

PX0H

57

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